chrome/browser/io_thread.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/browser/io_thread.h"
   6
   7 #include <vector>
   8
   9 #include "base/base64.h"
  10 #include "base/bind.h"
  11 #include "base/bind_helpers.h"
  12 #include "base/command_line.h"
  13 #include "base/compiler_specific.h"
  14 #include "base/debug/leak_tracker.h"
  15 #include "base/logging.h"
  16 #include "base/metrics/field_trial.h"
  17 #include "base/prefs/pref_registry_simple.h"
  18 #include "base/prefs/pref_service.h"
  19 #include "base/profiler/scoped_tracker.h"
  20 #include "base/stl_util.h"
  21 #include "base/strings/string_number_conversions.h"
  22 #include "base/strings/string_piece.h"
  23 #include "base/strings/string_split.h"
  24 #include "base/strings/string_util.h"
  25 #include "base/threading/sequenced_worker_pool.h"
  26 #include "base/threading/thread.h"
  27 #include "base/threading/worker_pool.h"
  28 #include "base/time/time.h"
  29 #include "base/trace_event/trace_event.h"
  30 #include "build/build_config.h"
  31 #include "chrome/browser/browser_process.h"
  32 #include "chrome/browser/net/async_dns_field_trial.h"
  33 #include "chrome/browser/net/chrome_net_log.h"
  34 #include "chrome/browser/net/chrome_network_delegate.h"
  35 #include "chrome/browser/net/connect_interceptor.h"
  36 #include "chrome/browser/net/dns_probe_service.h"
  37 #include "chrome/browser/net/pref_proxy_config_tracker.h"
  38 #include "chrome/browser/net/proxy_service_factory.h"
  39 #include "chrome/common/channel_info.h"
  40 #include "chrome/common/chrome_content_client.h"
  41 #include "chrome/common/chrome_switches.h"
  42 #include "chrome/common/pref_names.h"
  43 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_prefs.h"
  44 #include "components/data_reduction_proxy/core/common/data_reduction_proxy_params.h"
  45 #include "components/policy/core/common/policy_service.h"
  46 #include "components/variations/variations_associated_data.h"
  47 #include "components/version_info/version_info.h"
  48 #include "content/public/browser/browser_thread.h"
  49 #include "content/public/browser/cookie_store_factory.h"
  50 #include "content/public/common/user_agent.h"
  51 #include "net/base/external_estimate_provider.h"
  52 #include "net/base/host_mapping_rules.h"
  53 #include "net/base/net_util.h"
  54 #include "net/base/network_quality_estimator.h"
  55 #include "net/base/sdch_manager.h"
  56 #include "net/cert/cert_policy_enforcer.h"
  57 #include "net/cert/cert_verifier.h"
  58 #include "net/cert/cert_verify_proc.h"
  59 #include "net/cert/ct_known_logs.h"
  60 #include "net/cert/ct_known_logs_static.h"
  61 #include "net/cert/ct_log_verifier.h"
  62 #include "net/cert/ct_verifier.h"
  63 #include "net/cert/multi_log_ct_verifier.h"
  64 #include "net/cert/multi_threaded_cert_verifier.h"
  65 #include "net/cookies/cookie_store.h"
  66 #include "net/dns/host_cache.h"
  67 #include "net/dns/host_resolver.h"
  68 #include "net/dns/mapped_host_resolver.h"
  69 #include "net/ftp/ftp_network_layer.h"
  70 #include "net/http/http_auth_filter.h"
  71 #include "net/http/http_auth_handler_factory.h"
  72 #include "net/http/http_network_layer.h"
  73 #include "net/http/http_server_properties_impl.h"
  74 #include "net/proxy/proxy_config_service.h"
  75 #include "net/proxy/proxy_script_fetcher_impl.h"
  76 #include "net/proxy/proxy_service.h"
  77 #include "net/quic/crypto/crypto_protocol.h"
  78 #include "net/quic/quic_protocol.h"
  79 #include "net/quic/quic_utils.h"
  80 #include "net/socket/tcp_client_socket.h"
  81 #include "net/spdy/spdy_session.h"
  82 #include "net/ssl/channel_id_service.h"
  83 #include "net/ssl/default_channel_id_store.h"
  84 #include "net/url_request/data_protocol_handler.h"
  85 #include "net/url_request/file_protocol_handler.h"
  86 #include "net/url_request/ftp_protocol_handler.h"
  87 #include "net/url_request/static_http_user_agent_settings.h"
  88 #include "net/url_request/url_fetcher.h"
  89 #include "net/url_request/url_request_backoff_manager.h"
  90 #include "net/url_request/url_request_context.h"
  91 #include "net/url_request/url_request_context_getter.h"
  92 #include "net/url_request/url_request_job_factory_impl.h"
  93 #include "url/url_constants.h"
  94
  95 #if defined(ENABLE_CONFIGURATION_POLICY)
  96 #include "policy/policy_constants.h"
  97 #endif
  98
  99 #if defined(ENABLE_EXTENSIONS)
 100 #include "chrome/browser/extensions/event_router_forwarder.h"
 101 #endif
 102
 103 #if defined(USE_NSS_CERTS) || defined(OS_IOS)
 104 #include "net/cert_net/nss_ocsp.h"
 105 #endif
 106
 107 #if defined(OS_ANDROID)
 108 #include "base/android/build_info.h"
 109 #include "chrome/browser/android/net/external_estimate_provider_android.h"
 110 #endif
 111
 112 #if defined(OS_CHROMEOS)
 113 #include "chrome/browser/chromeos/net/cert_verify_proc_chromeos.h"
 114 #include "chromeos/network/host_resolver_impl_chromeos.h"
 115 #endif
 116
 117 using content::BrowserThread;
 118
 119 class SafeBrowsingURLRequestContext;
 120
 121 // The IOThread object must outlive any tasks posted to the IO thread before the
 122 // Quit task, so base::Bind() calls are not refcounted.
 123
 124 namespace {
 125
 126 const char kTCPFastOpenFieldTrialName[] = "TCPFastOpen";
 127 const char kTCPFastOpenHttpsEnabledGroupName[] = "HttpsEnabled";
 128
 129 const char kQuicFieldTrialName[] = "QUIC";
 130 const char kQuicFieldTrialEnabledGroupName[] = "Enabled";
 131 const char kQuicFieldTrialHttpsEnabledGroupName[] = "HttpsEnabled";
 132
 133 // The SPDY trial composes two different trial plus control groups:
 134 //  * A "holdback" group with SPDY disabled, and corresponding control
 135 //  (SPDY/3.1). The primary purpose of the holdback group is to encourage site
 136 //  operators to do feature detection rather than UA-sniffing. As such, this
 137 //  trial runs continuously.
 138 //  * A SPDY/4 experiment, for SPDY/4 (aka HTTP/2) vs SPDY/3.1 comparisons and
 139 //  eventual SPDY/4 deployment.
 140 const char kSpdyFieldTrialName[] = "SPDY";
 141 const char kSpdyFieldTrialHoldbackGroupNamePrefix[] = "SpdyDisabled";
 142 const char kSpdyFieldTrialSpdy31GroupNamePrefix[] = "Spdy31Enabled";
 143 const char kSpdyFieldTrialSpdy4GroupNamePrefix[] = "Spdy4Enabled";
 144 const char kSpdyFieldTrialParametrizedPrefix[] = "Parametrized";
 145
 146 // Field trial for network quality estimator. Seeds RTT and downstream
 147 // throughput observations with values that correspond to the connection type
 148 // determined by the operating system.
 149 const char kNetworkQualityEstimatorFieldTrialName[] = "NetworkQualityEstimator";
 150
 151 #if defined(OS_MACOSX) && !defined(OS_IOS)
 152 void ObserveKeychainEvents() {
 153   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 154   net::CertDatabase::GetInstance()->SetMessageLoopForKeychainEvents();
 155 }
 156 #endif
 157
 158 // Used for the "system" URLRequestContext.
 159 class SystemURLRequestContext : public net::URLRequestContext {
 160  public:
 161   SystemURLRequestContext() {
 162 #if defined(USE_NSS_CERTS) || defined(OS_IOS)
 163     net::SetURLRequestContextForNSSHttpIO(this);
 164 #endif
 165   }
 166
 167  private:
 168   ~SystemURLRequestContext() override {
 169     AssertNoURLRequests();
 170 #if defined(USE_NSS_CERTS) || defined(OS_IOS)
 171     net::SetURLRequestContextForNSSHttpIO(NULL);
 172 #endif
 173   }
 174 };
 175
 176 scoped_ptr<net::HostResolver> CreateGlobalHostResolver(net::NetLog* net_log) {
 177   TRACE_EVENT0("startup", "IOThread::CreateGlobalHostResolver");
 178   const base::CommandLine& command_line =
 179       *base::CommandLine::ForCurrentProcess();
 180
 181   net::HostResolver::Options options;
 182
 183   // Use the retry attempts override from the command-line, if any.
 184   if (command_line.HasSwitch(switches::kHostResolverRetryAttempts)) {
 185     std::string s =
 186         command_line.GetSwitchValueASCII(switches::kHostResolverRetryAttempts);
 187     // Parse the switch (it should be a non-negative integer).
 188     int n;
 189     if (base::StringToInt(s, &n) && n >= 0) {
 190       options.max_retry_attempts = static_cast<size_t>(n);
 191     } else {
 192       LOG(ERROR) << "Invalid switch for host resolver retry attempts: " << s;
 193     }
 194   }
 195
 196   scoped_ptr<net::HostResolver> global_host_resolver;
 197 #if defined OS_CHROMEOS
 198   global_host_resolver =
 199       chromeos::HostResolverImplChromeOS::CreateSystemResolver(options,
 200                                                                net_log);
 201 #else
 202   global_host_resolver =
 203       net::HostResolver::CreateSystemResolver(options, net_log);
 204 #endif
 205
 206   // If hostname remappings were specified on the command-line, layer these
 207   // rules on top of the real host resolver. This allows forwarding all requests
 208   // through a designated test server.
 209   if (!command_line.HasSwitch(switches::kHostResolverRules))
 210     return global_host_resolver.Pass();
 211
 212   scoped_ptr<net::MappedHostResolver> remapped_resolver(
 213       new net::MappedHostResolver(global_host_resolver.Pass()));
 214   remapped_resolver->SetRulesFromString(
 215       command_line.GetSwitchValueASCII(switches::kHostResolverRules));
 216   return remapped_resolver.Pass();
 217 }
 218
 219 // TODO(willchan): Remove proxy script fetcher context since it's not necessary
 220 // now that I got rid of refcounting URLRequestContexts.
 221 // See IOThread::Globals for details.
 222 net::URLRequestContext*
 223 ConstructProxyScriptFetcherContext(IOThread::Globals* globals,
 224                                    net::NetLog* net_log) {
 225   net::URLRequestContext* context = new net::URLRequestContext;
 226   context->set_net_log(net_log);
 227   context->set_host_resolver(globals->host_resolver.get());
 228   context->set_cert_verifier(globals->cert_verifier.get());
 229   context->set_transport_security_state(
 230       globals->transport_security_state.get());
 231   context->set_cert_transparency_verifier(
 232       globals->cert_transparency_verifier.get());
 233   context->set_http_auth_handler_factory(
 234       globals->http_auth_handler_factory.get());
 235   context->set_proxy_service(globals->proxy_script_fetcher_proxy_service.get());
 236   context->set_http_transaction_factory(
 237       globals->proxy_script_fetcher_http_transaction_factory.get());
 238   context->set_job_factory(
 239       globals->proxy_script_fetcher_url_request_job_factory.get());
 240   context->set_cookie_store(globals->system_cookie_store.get());
 241   context->set_channel_id_service(
 242       globals->system_channel_id_service.get());
 243   context->set_network_delegate(globals->system_network_delegate.get());
 244   context->set_http_user_agent_settings(
 245       globals->http_user_agent_settings.get());
 246   // TODO(rtenneti): We should probably use HttpServerPropertiesManager for the
 247   // system URLRequestContext too. There's no reason this should be tied to a
 248   // profile.
 249   return context;
 250 }
 251
 252 net::URLRequestContext*
 253 ConstructSystemRequestContext(IOThread::Globals* globals,
 254                               net::NetLog* net_log) {
 255   net::URLRequestContext* context = new SystemURLRequestContext;
 256   context->set_net_log(net_log);
 257   context->set_host_resolver(globals->host_resolver.get());
 258   context->set_cert_verifier(globals->cert_verifier.get());
 259   context->set_transport_security_state(
 260       globals->transport_security_state.get());
 261   context->set_cert_transparency_verifier(
 262       globals->cert_transparency_verifier.get());
 263   context->set_http_auth_handler_factory(
 264       globals->http_auth_handler_factory.get());
 265   context->set_proxy_service(globals->system_proxy_service.get());
 266   context->set_http_transaction_factory(
 267       globals->system_http_transaction_factory.get());
 268   context->set_job_factory(globals->system_url_request_job_factory.get());
 269   context->set_cookie_store(globals->system_cookie_store.get());
 270   context->set_channel_id_service(
 271       globals->system_channel_id_service.get());
 272   context->set_network_delegate(globals->system_network_delegate.get());
 273   context->set_http_user_agent_settings(
 274       globals->http_user_agent_settings.get());
 275   context->set_network_quality_estimator(
 276       globals->network_quality_estimator.get());
 277   context->set_backoff_manager(globals->url_request_backoff_manager.get());
 278   return context;
 279 }
 280
 281 int GetSwitchValueAsInt(const base::CommandLine& command_line,
 282                         const std::string& switch_name) {
 283   int value;
 284   if (!base::StringToInt(command_line.GetSwitchValueASCII(switch_name),
 285                          &value)) {
 286     return 0;
 287   }
 288   return value;
 289 }
 290
 291 // Returns the value associated with |key| in |params| or "" if the
 292 // key is not present in the map.
 293 const std::string& GetVariationParam(
 294     const std::map<std::string, std::string>& params,
 295     const std::string& key) {
 296   std::map<std::string, std::string>::const_iterator it = params.find(key);
 297   if (it == params.end())
 298     return base::EmptyString();
 299
 300   return it->second;
 301 }
 302
 303 // Parse kUseSpdy command line flag options, which may contain the following:
 304 //
 305 //   "off"                      : Disables SPDY support entirely.
 306 //   "no-ping"                  : Disables SPDY ping connection testing.
 307 //   "exclude=<host>"           : Disables SPDY support for the host <host>.
 308 //   "no-compress"              : Disables SPDY header compression.
 309 //   "no-alt-protocols          : Disables alternate protocol support.
 310 //   "init-max-streams=<limit>" : Specifies the maximum number of concurrent
 311 //                                streams for a SPDY session, unless the
 312 //                                specifies a different value via SETTINGS.
 313 void ConfigureSpdyGlobalsFromUseSpdyArgument(const std::string& mode,
 314                                              IOThread::Globals* globals) {
 315   static const char kOff[] = "off";
 316   static const char kDisablePing[] = "no-ping";
 317   static const char kExclude[] = "exclude";  // Hosts to exclude
 318   static const char kDisableCompression[] = "no-compress";
 319   static const char kDisableAltProtocols[] = "no-alt-protocols";
 320   static const char kInitialMaxConcurrentStreams[] = "init-max-streams";
 321
 322   for (const base::StringPiece& element : base::SplitStringPiece(
 323            mode, ",", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL)) {
 324     std::vector<base::StringPiece> name_value = base::SplitStringPiece(
 325         element, "=", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
 326     const base::StringPiece option =
 327         name_value.size() > 0 ? name_value[0] : base::StringPiece();
 328     const base::StringPiece value =
 329         name_value.size() > 1 ? name_value[1] : base::StringPiece();
 330
 331     if (option == kOff) {
 332       net::HttpStreamFactory::set_spdy_enabled(false);
 333       continue;
 334     }
 335     if (option == kDisablePing) {
 336       globals->enable_spdy_ping_based_connection_checking.set(false);
 337       continue;
 338     }
 339     if (option == kExclude) {
 340       globals->forced_spdy_exclusions.insert(
 341           net::HostPortPair::FromURL(GURL(value.as_string())));
 342       continue;
 343     }
 344     if (option == kDisableCompression) {
 345       globals->enable_spdy_compression.set(false);
 346       continue;
 347     }
 348     if (option == kDisableAltProtocols) {
 349       globals->use_alternative_services.set(false);
 350       continue;
 351     }
 352     if (option == kInitialMaxConcurrentStreams) {
 353       int streams;
 354       if (base::StringToInt(value, &streams)) {
 355         globals->initial_max_spdy_concurrent_streams.set(streams);
 356         continue;
 357       }
 358     }
 359     LOG(DFATAL) << "Unrecognized spdy option: " << option.as_string();
 360   }
 361 }
 362
 363 }  // namespace
 364
 365 class IOThread::LoggingNetworkChangeObserver
 366     : public net::NetworkChangeNotifier::IPAddressObserver,
 367       public net::NetworkChangeNotifier::ConnectionTypeObserver,
 368       public net::NetworkChangeNotifier::NetworkChangeObserver {
 369  public:
 370   // |net_log| must remain valid throughout our lifetime.
 371   explicit LoggingNetworkChangeObserver(net::NetLog* net_log)
 372       : net_log_(net_log) {
 373     net::NetworkChangeNotifier::AddIPAddressObserver(this);
 374     net::NetworkChangeNotifier::AddConnectionTypeObserver(this);
 375     net::NetworkChangeNotifier::AddNetworkChangeObserver(this);
 376   }
 377
 378   ~LoggingNetworkChangeObserver() override {
 379     net::NetworkChangeNotifier::RemoveIPAddressObserver(this);
 380     net::NetworkChangeNotifier::RemoveConnectionTypeObserver(this);
 381     net::NetworkChangeNotifier::RemoveNetworkChangeObserver(this);
 382   }
 383
 384   // NetworkChangeNotifier::IPAddressObserver implementation.
 385   void OnIPAddressChanged() override {
 386     VLOG(1) << "Observed a change to the network IP addresses";
 387
 388     net_log_->AddGlobalEntry(net::NetLog::TYPE_NETWORK_IP_ADDRESSES_CHANGED);
 389   }
 390
 391   // NetworkChangeNotifier::ConnectionTypeObserver implementation.
 392   void OnConnectionTypeChanged(
 393       net::NetworkChangeNotifier::ConnectionType type) override {
 394     std::string type_as_string =
 395         net::NetworkChangeNotifier::ConnectionTypeToString(type);
 396
 397     VLOG(1) << "Observed a change to network connectivity state "
 398             << type_as_string;
 399
 400     net_log_->AddGlobalEntry(
 401         net::NetLog::TYPE_NETWORK_CONNECTIVITY_CHANGED,
 402         net::NetLog::StringCallback("new_connection_type", &type_as_string));
 403   }
 404
 405   // NetworkChangeNotifier::NetworkChangeObserver implementation.
 406   void OnNetworkChanged(
 407       net::NetworkChangeNotifier::ConnectionType type) override {
 408     std::string type_as_string =
 409         net::NetworkChangeNotifier::ConnectionTypeToString(type);
 410
 411     VLOG(1) << "Observed a network change to state " << type_as_string;
 412
 413     net_log_->AddGlobalEntry(
 414         net::NetLog::TYPE_NETWORK_CHANGED,
 415         net::NetLog::StringCallback("new_connection_type", &type_as_string));
 416   }
 417
 418  private:
 419   net::NetLog* net_log_;
 420   DISALLOW_COPY_AND_ASSIGN(LoggingNetworkChangeObserver);
 421 };
 422
 423 class SystemURLRequestContextGetter : public net::URLRequestContextGetter {
 424  public:
 425   explicit SystemURLRequestContextGetter(IOThread* io_thread);
 426
 427   // Implementation for net::UrlRequestContextGetter.
 428   net::URLRequestContext* GetURLRequestContext() override;
 429   scoped_refptr<base::SingleThreadTaskRunner> GetNetworkTaskRunner()
 430       const override;
 431
 432  protected:
 433   ~SystemURLRequestContextGetter() override;
 434
 435  private:
 436   IOThread* const io_thread_;  // Weak pointer, owned by BrowserProcess.
 437   scoped_refptr<base::SingleThreadTaskRunner> network_task_runner_;
 438
 439   base::debug::LeakTracker<SystemURLRequestContextGetter> leak_tracker_;
 440 };
 441
 442 SystemURLRequestContextGetter::SystemURLRequestContextGetter(
 443     IOThread* io_thread)
 444     : io_thread_(io_thread),
 445       network_task_runner_(
 446           BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO)) {
 447 }
 448
 449 SystemURLRequestContextGetter::~SystemURLRequestContextGetter() {}
 450
 451 net::URLRequestContext* SystemURLRequestContextGetter::GetURLRequestContext() {
 452   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 453   DCHECK(io_thread_->globals()->system_request_context.get());
 454
 455   return io_thread_->globals()->system_request_context.get();
 456 }
 457
 458 scoped_refptr<base::SingleThreadTaskRunner>
 459 SystemURLRequestContextGetter::GetNetworkTaskRunner() const {
 460   return network_task_runner_;
 461 }
 462
 463 IOThread::Globals::
 464 SystemRequestContextLeakChecker::SystemRequestContextLeakChecker(
 465     Globals* globals)
 466     : globals_(globals) {
 467   DCHECK(globals_);
 468 }
 469
 470 IOThread::Globals::
 471 SystemRequestContextLeakChecker::~SystemRequestContextLeakChecker() {
 472   if (globals_->system_request_context.get())
 473     globals_->system_request_context->AssertNoURLRequests();
 474 }
 475
 476 IOThread::Globals::Globals()
 477     : system_request_context_leak_checker(this),
 478       ignore_certificate_errors(false),
 479       testing_fixed_http_port(0),
 480       testing_fixed_https_port(0),
 481       enable_user_alternate_protocol_ports(false) {
 482 }
 483
 484 IOThread::Globals::~Globals() {}
 485
 486 // |local_state| is passed in explicitly in order to (1) reduce implicit
 487 // dependencies and (2) make IOThread more flexible for testing.
 488 IOThread::IOThread(
 489     PrefService* local_state,
 490     policy::PolicyService* policy_service,
 491     ChromeNetLog* net_log,
 492     extensions::EventRouterForwarder* extension_event_router_forwarder)
 493     : net_log_(net_log),
 494 #if defined(ENABLE_EXTENSIONS)
 495       extension_event_router_forwarder_(extension_event_router_forwarder),
 496 #endif
 497       globals_(NULL),
 498       is_spdy_disabled_by_policy_(false),
 499       is_quic_allowed_by_policy_(true),
 500       creation_time_(base::TimeTicks::Now()),
 501       weak_factory_(this) {
 502   auth_schemes_ = local_state->GetString(prefs::kAuthSchemes);
 503   negotiate_disable_cname_lookup_ = local_state->GetBoolean(
 504       prefs::kDisableAuthNegotiateCnameLookup);
 505   negotiate_enable_port_ = local_state->GetBoolean(
 506       prefs::kEnableAuthNegotiatePort);
 507   auth_server_whitelist_ = local_state->GetString(prefs::kAuthServerWhitelist);
 508   auth_delegate_whitelist_ = local_state->GetString(
 509       prefs::kAuthNegotiateDelegateWhitelist);
 510   gssapi_library_name_ = local_state->GetString(prefs::kGSSAPILibraryName);
 511   auth_android_negotiate_account_type_ =
 512       local_state->GetString(prefs::kAuthAndroidNegotiateAccountType);
 513   pref_proxy_config_tracker_.reset(
 514       ProxyServiceFactory::CreatePrefProxyConfigTrackerOfLocalState(
 515           local_state));
 516   ChromeNetworkDelegate::InitializePrefsOnUIThread(
 517       &system_enable_referrers_,
 518       NULL,
 519       NULL,
 520       NULL,
 521       local_state);
 522   ssl_config_service_manager_.reset(
 523       SSLConfigServiceManager::CreateDefaultManager(local_state));
 524
 525   base::Value* dns_client_enabled_default = new base::FundamentalValue(
 526       chrome_browser_net::ConfigureAsyncDnsFieldTrial());
 527   local_state->SetDefaultPrefValue(prefs::kBuiltInDnsClientEnabled,
 528                                    dns_client_enabled_default);
 529   chrome_browser_net::LogAsyncDnsPrefSource(
 530       local_state->FindPreference(prefs::kBuiltInDnsClientEnabled));
 531
 532   dns_client_enabled_.Init(prefs::kBuiltInDnsClientEnabled,
 533                            local_state,
 534                            base::Bind(&IOThread::UpdateDnsClientEnabled,
 535                                       base::Unretained(this)));
 536   dns_client_enabled_.MoveToThread(
 537       BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO));
 538
 539   quick_check_enabled_.Init(prefs::kQuickCheckEnabled,
 540                             local_state);
 541   quick_check_enabled_.MoveToThread(
 542       BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO));
 543
 544 #if defined(ENABLE_CONFIGURATION_POLICY)
 545   is_spdy_disabled_by_policy_ = policy_service->GetPolicies(
 546       policy::PolicyNamespace(policy::POLICY_DOMAIN_CHROME, std::string())).Get(
 547           policy::key::kDisableSpdy) != NULL;
 548
 549   const base::Value* value = policy_service->GetPolicies(
 550       policy::PolicyNamespace(policy::POLICY_DOMAIN_CHROME,
 551       std::string())).GetValue(policy::key::kQuicAllowed);
 552   if (value)
 553     value->GetAsBoolean(&is_quic_allowed_by_policy_);
 554 #endif  // ENABLE_CONFIGURATION_POLICY
 555
 556   BrowserThread::SetDelegate(BrowserThread::IO, this);
 557 }
 558
 559 IOThread::~IOThread() {
 560   // This isn't needed for production code, but in tests, IOThread may
 561   // be multiply constructed.
 562   BrowserThread::SetDelegate(BrowserThread::IO, NULL);
 563
 564   pref_proxy_config_tracker_->DetachFromPrefService();
 565   DCHECK(!globals_);
 566 }
 567
 568 IOThread::Globals* IOThread::globals() {
 569   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 570   return globals_;
 571 }
 572
 573 void IOThread::SetGlobalsForTesting(Globals* globals) {
 574   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 575   DCHECK(!globals || !globals_);
 576   globals_ = globals;
 577 }
 578
 579 ChromeNetLog* IOThread::net_log() {
 580   return net_log_;
 581 }
 582
 583 void IOThread::ChangedToOnTheRecord() {
 584   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 585   BrowserThread::PostTask(
 586       BrowserThread::IO,
 587       FROM_HERE,
 588       base::Bind(&IOThread::ChangedToOnTheRecordOnIOThread,
 589                  base::Unretained(this)));
 590 }
 591
 592 net::URLRequestContextGetter* IOThread::system_url_request_context_getter() {
 593   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 594   if (!system_url_request_context_getter_.get()) {
 595     InitSystemRequestContext();
 596   }
 597   return system_url_request_context_getter_.get();
 598 }
 599
 600 void IOThread::Init() {
 601   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 602   // is fixed.
 603   tracked_objects::ScopedTracker tracking_profile1(
 604       FROM_HERE_WITH_EXPLICIT_FUNCTION("466432 IOThread::InitAsync::Start"));
 605   TRACE_EVENT0("startup", "IOThread::InitAsync");
 606   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 607
 608 #if defined(USE_NSS_CERTS) || defined(OS_IOS)
 609   net::SetMessageLoopForNSSHttpIO();
 610 #endif
 611
 612   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 613   // is fixed.
 614   tracked_objects::ScopedTracker tracking_profile2(
 615       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 616           "466432 IOThread::InitAsync::CommandLineForCurrentProcess"));
 617   const base::CommandLine& command_line =
 618       *base::CommandLine::ForCurrentProcess();
 619
 620   DCHECK(!globals_);
 621   globals_ = new Globals;
 622
 623   // Add an observer that will emit network change events to the ChromeNetLog.
 624   // Assuming NetworkChangeNotifier dispatches in FIFO order, we should be
 625   // logging the network change before other IO thread consumers respond to it.
 626   network_change_observer_.reset(
 627       new LoggingNetworkChangeObserver(net_log_));
 628
 629   // Setup the HistogramWatcher to run on the IO thread.
 630   net::NetworkChangeNotifier::InitHistogramWatcher();
 631
 632 #if defined(ENABLE_EXTENSIONS)
 633   globals_->extension_event_router_forwarder =
 634       extension_event_router_forwarder_;
 635 #endif
 636
 637   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 638   // is fixed.
 639   tracked_objects::ScopedTracker tracking_profile3(
 640       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 641           "466432 IOThread::InitAsync::ChromeNetworkDelegate"));
 642   scoped_ptr<ChromeNetworkDelegate> chrome_network_delegate(
 643       new ChromeNetworkDelegate(extension_event_router_forwarder(),
 644                                 &system_enable_referrers_));
 645
 646   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 647   // is fixed.
 648   tracked_objects::ScopedTracker tracking_profile4(
 649       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 650           "466432 IOThread::InitAsync::CreateGlobalHostResolver"));
 651   globals_->system_network_delegate = chrome_network_delegate.Pass();
 652   globals_->host_resolver = CreateGlobalHostResolver(net_log_);
 653
 654   std::map<std::string, std::string> network_quality_estimator_params;
 655   variations::GetVariationParams(kNetworkQualityEstimatorFieldTrialName,
 656                                  &network_quality_estimator_params);
 657
 658   scoped_ptr<net::ExternalEstimateProvider> external_estimate_provider;
 659 #if defined(OS_ANDROID)
 660   external_estimate_provider.reset(
 661       new chrome::android::ExternalEstimateProviderAndroid());
 662 #endif
 663   // Pass ownership.
 664   globals_->network_quality_estimator.reset(new net::NetworkQualityEstimator(
 665       external_estimate_provider.Pass(), network_quality_estimator_params));
 666
 667   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 668   // is fixed.
 669   tracked_objects::ScopedTracker tracking_profile5(
 670       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 671           "466432 IOThread::InitAsync::UpdateDnsClientEnabled::Start"));
 672   UpdateDnsClientEnabled();
 673   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 674   // is fixed.
 675   tracked_objects::ScopedTracker tracking_profile6(
 676       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 677           "466432 IOThread::InitAsync::UpdateDnsClientEnabled::End"));
 678 #if defined(OS_CHROMEOS)
 679   // Creates a CertVerifyProc that doesn't allow any profile-provided certs.
 680   globals_->cert_verifier.reset(new net::MultiThreadedCertVerifier(
 681       new chromeos::CertVerifyProcChromeOS()));
 682 #else
 683   globals_->cert_verifier.reset(new net::MultiThreadedCertVerifier(
 684       net::CertVerifyProc::CreateDefault()));
 685 #endif
 686
 687   globals_->transport_security_state.reset(new net::TransportSecurityState());
 688
 689   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 690   // is fixed.
 691   tracked_objects::ScopedTracker tracking_profile8(
 692       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 693           "466432 IOThread::InitAsync::CreateLogVerifiers::Start"));
 694   std::vector<scoped_refptr<net::CTLogVerifier>> ct_logs(
 695       net::ct::CreateLogVerifiersForKnownLogs());
 696
 697   // Add logs from command line
 698   if (command_line.HasSwitch(switches::kCertificateTransparencyLog)) {
 699     std::string switch_value = command_line.GetSwitchValueASCII(
 700         switches::kCertificateTransparencyLog);
 701     for (const base::StringPiece& curr_log : base::SplitStringPiece(
 702              switch_value, ",", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL)) {
 703       std::vector<std::string> log_metadata = base::SplitString(
 704           curr_log, ":", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
 705       CHECK_GE(log_metadata.size(), 3u)
 706           << "CT log metadata missing: Switch format is "
 707           << "'description:base64_key:url_without_schema'.";
 708       std::string log_description(log_metadata[0]);
 709       std::string log_url(std::string("https://") + log_metadata[2]);
 710       std::string ct_public_key_data;
 711       CHECK(base::Base64Decode(log_metadata[1], &ct_public_key_data))
 712           << "Unable to decode CT public key.";
 713       scoped_refptr<net::CTLogVerifier> external_log_verifier(
 714           net::CTLogVerifier::Create(ct_public_key_data, log_description,
 715                                      log_url));
 716       CHECK(external_log_verifier) << "Unable to parse CT public key.";
 717       VLOG(1) << "Adding log with description " << log_description;
 718       ct_logs.push_back(external_log_verifier);
 719     }
 720   }
 721
 722   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 723   // is fixed.
 724   tracked_objects::ScopedTracker tracking_profile9(
 725       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 726           "466432 IOThread::InitAsync::CreateLogVerifiers::End"));
 727   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 728   // is fixed.
 729   tracked_objects::ScopedTracker tracking_profile7(
 730       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 731           "466432 IOThread::InitAsync::CreateMultiLogVerifier"));
 732   net::MultiLogCTVerifier* ct_verifier = new net::MultiLogCTVerifier();
 733   globals_->cert_transparency_verifier.reset(ct_verifier);
 734   // Add built-in logs
 735   ct_verifier->AddLogs(ct_logs);
 736
 737   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 738   // is fixed.
 739   tracked_objects::ScopedTracker tracking_profile10(
 740       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 741           "466432 IOThread::InitAsync::CertPolicyEnforcer"));
 742   net::CertPolicyEnforcer* policy_enforcer = new net::CertPolicyEnforcer;
 743   globals_->cert_policy_enforcer.reset(policy_enforcer);
 744
 745   globals_->ssl_config_service = GetSSLConfigService();
 746
 747   globals_->http_auth_handler_factory.reset(CreateDefaultAuthHandlerFactory(
 748       globals_->host_resolver.get()));
 749   globals_->http_server_properties.reset(new net::HttpServerPropertiesImpl());
 750   // For the ProxyScriptFetcher, we use a direct ProxyService.
 751   globals_->proxy_script_fetcher_proxy_service.reset(
 752       net::ProxyService::CreateDirectWithNetLog(net_log_));
 753   // In-memory cookie store.
 754   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 755   // is fixed.
 756   tracked_objects::ScopedTracker tracking_profile11(
 757       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 758           "466432 IOThread::InitAsync::CreateCookieStore::Start"));
 759   globals_->system_cookie_store =
 760         content::CreateCookieStore(content::CookieStoreConfig());
 761   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 762   // is fixed.
 763   tracked_objects::ScopedTracker tracking_profile12(
 764       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 765           "466432 IOThread::InitAsync::CreateCookieStore::End"));
 766   // In-memory channel ID store.
 767   globals_->system_channel_id_service.reset(
 768       new net::ChannelIDService(
 769           new net::DefaultChannelIDStore(NULL),
 770           base::WorkerPool::GetTaskRunner(true)));
 771   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 772   // is fixed.
 773   tracked_objects::ScopedTracker tracking_profile12_1(
 774       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 775           "466432 IOThread::InitAsync::CreateDnsProbeService"));
 776   globals_->dns_probe_service.reset(new chrome_browser_net::DnsProbeService());
 777   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 778   // is fixed.
 779   tracked_objects::ScopedTracker tracking_profile12_2(
 780       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 781           "466432 IOThread::InitAsync::CreateHostMappingRules"));
 782   globals_->host_mapping_rules.reset(new net::HostMappingRules());
 783   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 784   // is fixed.
 785   tracked_objects::ScopedTracker tracking_profile12_3(
 786       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 787           "466432 IOThread::InitAsync::CreateHTTPUserAgentSettings"));
 788   globals_->http_user_agent_settings.reset(
 789       new net::StaticHttpUserAgentSettings(std::string(), GetUserAgent()));
 790   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 791   // is fixed.
 792   tracked_objects::ScopedTracker tracking_profile12_4(
 793       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 794           "466432 IOThread::InitAsync::CommandLineConfiguration"));
 795   if (command_line.HasSwitch(switches::kHostRules)) {
 796     TRACE_EVENT_BEGIN0("startup", "IOThread::InitAsync:SetRulesFromString");
 797     globals_->host_mapping_rules->SetRulesFromString(
 798         command_line.GetSwitchValueASCII(switches::kHostRules));
 799     TRACE_EVENT_END0("startup", "IOThread::InitAsync:SetRulesFromString");
 800   }
 801   if (command_line.HasSwitch(switches::kIgnoreCertificateErrors))
 802     globals_->ignore_certificate_errors = true;
 803   if (command_line.HasSwitch(switches::kTestingFixedHttpPort)) {
 804     globals_->testing_fixed_http_port =
 805         GetSwitchValueAsInt(command_line, switches::kTestingFixedHttpPort);
 806   }
 807   if (command_line.HasSwitch(switches::kTestingFixedHttpsPort)) {
 808     globals_->testing_fixed_https_port =
 809         GetSwitchValueAsInt(command_line, switches::kTestingFixedHttpsPort);
 810   }
 811   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 812   // is fixed.
 813   tracked_objects::ScopedTracker tracking_profile12_5(
 814       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 815           "466432 IOThread::InitAsync::QuicConfiguration"));
 816   ConfigureQuic(command_line);
 817   if (command_line.HasSwitch(
 818           switches::kEnableUserAlternateProtocolPorts)) {
 819     globals_->enable_user_alternate_protocol_ports = true;
 820   }
 821   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 822   // is fixed.
 823   tracked_objects::ScopedTracker tracking_profile13(
 824       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 825           "466432 IOThread::InitAsync::InitializeNetworkOptions"));
 826   InitializeNetworkOptions(command_line);
 827
 828   net::HttpNetworkSession::Params session_params;
 829   InitializeNetworkSessionParams(&session_params);
 830   session_params.net_log = net_log_;
 831   session_params.proxy_service =
 832       globals_->proxy_script_fetcher_proxy_service.get();
 833
 834   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 835   // is fixed.
 836   tracked_objects::ScopedTracker tracking_profile14(
 837       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 838           "466432 IOThread::InitAsync::HttpNetorkSession::Start"));
 839   TRACE_EVENT_BEGIN0("startup", "IOThread::InitAsync:HttpNetworkSession");
 840   scoped_refptr<net::HttpNetworkSession> network_session(
 841       new net::HttpNetworkSession(session_params));
 842   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 843   // is fixed.
 844   tracked_objects::ScopedTracker tracking_profile15(
 845       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 846           "466432 IOThread::InitAsync::HttpNetorkSession::End"));
 847   globals_->proxy_script_fetcher_http_transaction_factory
 848       .reset(new net::HttpNetworkLayer(network_session.get()));
 849   TRACE_EVENT_END0("startup", "IOThread::InitAsync:HttpNetworkSession");
 850   scoped_ptr<net::URLRequestJobFactoryImpl> job_factory(
 851       new net::URLRequestJobFactoryImpl());
 852
 853   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 854   // is fixed.
 855   tracked_objects::ScopedTracker tracking_profile16(
 856       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 857           "466432 IOThread::InitAsync::SetProtocolHandler"));
 858   job_factory->SetProtocolHandler(url::kDataScheme,
 859                                   new net::DataProtocolHandler());
 860   job_factory->SetProtocolHandler(
 861       url::kFileScheme,
 862       new net::FileProtocolHandler(
 863           content::BrowserThread::GetBlockingPool()->
 864               GetTaskRunnerWithShutdownBehavior(
 865                   base::SequencedWorkerPool::SKIP_ON_SHUTDOWN)));
 866 #if !defined(DISABLE_FTP_SUPPORT)
 867   globals_->proxy_script_fetcher_ftp_transaction_factory.reset(
 868       new net::FtpNetworkLayer(globals_->host_resolver.get()));
 869   job_factory->SetProtocolHandler(
 870       url::kFtpScheme,
 871       new net::FtpProtocolHandler(
 872           globals_->proxy_script_fetcher_ftp_transaction_factory.get()));
 873 #endif
 874   globals_->proxy_script_fetcher_url_request_job_factory = job_factory.Pass();
 875
 876   globals_->proxy_script_fetcher_context.reset(
 877       ConstructProxyScriptFetcherContext(globals_, net_log_));
 878
 879   const version_info::Channel channel = chrome::GetChannel();
 880   if (channel == version_info::Channel::UNKNOWN ||
 881       channel == version_info::Channel::CANARY ||
 882       channel == version_info::Channel::DEV) {
 883     globals_->url_request_backoff_manager.reset(
 884         new net::URLRequestBackoffManager());
 885   }
 886
 887 #if defined(OS_MACOSX) && !defined(OS_IOS)
 888   // Start observing Keychain events. This needs to be done on the UI thread,
 889   // as Keychain services requires a CFRunLoop.
 890   BrowserThread::PostTask(BrowserThread::UI,
 891                           FROM_HERE,
 892                           base::Bind(&ObserveKeychainEvents));
 893 #endif
 894
 895   // InitSystemRequestContext turns right around and posts a task back
 896   // to the IO thread, so we can't let it run until we know the IO
 897   // thread has started.
 898   //
 899   // Note that since we are at BrowserThread::Init time, the UI thread
 900   // is blocked waiting for the thread to start.  Therefore, posting
 901   // this task to the main thread's message loop here is guaranteed to
 902   // get it onto the message loop while the IOThread object still
 903   // exists.  However, the message might not be processed on the UI
 904   // thread until after IOThread is gone, so use a weak pointer.
 905   BrowserThread::PostTask(BrowserThread::UI,
 906                           FROM_HERE,
 907                           base::Bind(&IOThread::InitSystemRequestContext,
 908                                      weak_factory_.GetWeakPtr()));
 909 }
 910
 911 void IOThread::CleanUp() {
 912   base::debug::LeakTracker<SafeBrowsingURLRequestContext>::CheckForLeaks();
 913
 914 #if defined(USE_NSS_CERTS) || defined(OS_IOS)
 915   net::ShutdownNSSHttpIO();
 916 #endif
 917
 918   system_url_request_context_getter_ = NULL;
 919
 920   // Release objects that the net::URLRequestContext could have been pointing
 921   // to.
 922
 923   // Shutdown the HistogramWatcher on the IO thread.
 924   net::NetworkChangeNotifier::ShutdownHistogramWatcher();
 925
 926   // This must be reset before the ChromeNetLog is destroyed.
 927   network_change_observer_.reset();
 928
 929   system_proxy_config_service_.reset();
 930
 931   delete globals_;
 932   globals_ = NULL;
 933
 934   base::debug::LeakTracker<SystemURLRequestContextGetter>::CheckForLeaks();
 935 }
 936
 937 void IOThread::InitializeNetworkOptions(const base::CommandLine& command_line) {
 938   // Only handle use-spdy command line flags if "spdy.disabled" preference is
 939   // not disabled via policy.
 940   if (is_spdy_disabled_by_policy_) {
 941     base::FieldTrial* trial = base::FieldTrialList::Find(kSpdyFieldTrialName);
 942     if (trial)
 943       trial->Disable();
 944   } else {
 945     std::string group = base::FieldTrialList::FindFullName(kSpdyFieldTrialName);
 946     VariationParameters params;
 947     if (!variations::GetVariationParams(kSpdyFieldTrialName, &params)) {
 948       params.clear();
 949     }
 950     ConfigureSpdyGlobals(command_line, group, params, globals_);
 951   }
 952
 953   ConfigureTCPFastOpen(command_line);
 954
 955   // TODO(rch): Make the client socket factory a per-network session
 956   // instance, constructed from a NetworkSession::Params, to allow us
 957   // to move this option to IOThread::Globals &
 958   // HttpNetworkSession::Params.
 959 }
 960
 961 void IOThread::ConfigureTCPFastOpen(const base::CommandLine& command_line) {
 962   const std::string trial_group =
 963       base::FieldTrialList::FindFullName(kTCPFastOpenFieldTrialName);
 964   if (trial_group == kTCPFastOpenHttpsEnabledGroupName)
 965     globals_->enable_tcp_fast_open_for_ssl.set(true);
 966   bool always_enable_if_supported =
 967       command_line.HasSwitch(switches::kEnableTcpFastOpen);
 968   // Check for OS support of TCP FastOpen, and turn it on for all connections
 969   // if indicated by user.
 970   net::CheckSupportAndMaybeEnableTCPFastOpen(always_enable_if_supported);
 971 }
 972
 973 // static
 974 void IOThread::ConfigureSpdyGlobals(
 975     const base::CommandLine& command_line,
 976     base::StringPiece spdy_trial_group,
 977     const VariationParameters& spdy_trial_params,
 978     IOThread::Globals* globals) {
 979   if (command_line.HasSwitch(switches::kTrustedSpdyProxy)) {
 980     globals->trusted_spdy_proxy.set(
 981         command_line.GetSwitchValueASCII(switches::kTrustedSpdyProxy));
 982   }
 983   if (command_line.HasSwitch(switches::kIgnoreUrlFetcherCertRequests))
 984     net::URLFetcher::SetIgnoreCertificateRequests(true);
 985
 986   if (command_line.HasSwitch(switches::kUseSpdy)) {
 987     std::string spdy_mode =
 988         command_line.GetSwitchValueASCII(switches::kUseSpdy);
 989     ConfigureSpdyGlobalsFromUseSpdyArgument(spdy_mode, globals);
 990     return;
 991   }
 992
 993   globals->next_protos.clear();
 994   globals->next_protos.push_back(net::kProtoHTTP11);
 995   bool enable_quic = false;
 996   globals->enable_quic.CopyToIfSet(&enable_quic);
 997   if (enable_quic) {
 998     globals->next_protos.push_back(net::kProtoQUIC1SPDY3);
 999   }
1000
1001   // No SPDY command-line flags have been specified. Examine trial groups.
1002   if (spdy_trial_group.starts_with(kSpdyFieldTrialHoldbackGroupNamePrefix)) {
1003     net::HttpStreamFactory::set_spdy_enabled(false);
1004     return;
1005   }
1006   if (spdy_trial_group.starts_with(kSpdyFieldTrialSpdy31GroupNamePrefix)) {
1007     globals->next_protos.push_back(net::kProtoSPDY31);
1008     globals->use_alternative_services.set(true);
1009     return;
1010   }
1011   if (spdy_trial_group.starts_with(kSpdyFieldTrialSpdy4GroupNamePrefix)) {
1012     globals->next_protos.push_back(net::kProtoSPDY31);
1013     globals->next_protos.push_back(net::kProtoHTTP2_14);
1014     globals->next_protos.push_back(net::kProtoHTTP2);
1015     globals->use_alternative_services.set(true);
1016     return;
1017   }
1018   if (spdy_trial_group.starts_with(kSpdyFieldTrialParametrizedPrefix)) {
1019     bool spdy_enabled = false;
1020     if (base::LowerCaseEqualsASCII(
1021             GetVariationParam(spdy_trial_params, "enable_spdy31"), "true")) {
1022       globals->next_protos.push_back(net::kProtoSPDY31);
1023       spdy_enabled = true;
1024     }
1025     if (base::LowerCaseEqualsASCII(
1026             GetVariationParam(spdy_trial_params, "enable_http2_14"), "true")) {
1027       globals->next_protos.push_back(net::kProtoHTTP2_14);
1028       spdy_enabled = true;
1029     }
1030     if (base::LowerCaseEqualsASCII(
1031             GetVariationParam(spdy_trial_params, "enable_http2"), "true")) {
1032       globals->next_protos.push_back(net::kProtoHTTP2);
1033       spdy_enabled = true;
1034     }
1035     // TODO(bnc): HttpStreamFactory::spdy_enabled_ is redundant with
1036     // globals->next_protos, can it be eliminated?
1037     net::HttpStreamFactory::set_spdy_enabled(spdy_enabled);
1038     globals->use_alternative_services.set(true);
1039     return;
1040   }
1041
1042   // By default, enable HTTP/2.
1043   globals->next_protos.push_back(net::kProtoSPDY31);
1044   globals->next_protos.push_back(net::kProtoHTTP2_14);
1045   globals->next_protos.push_back(net::kProtoHTTP2);
1046   globals->use_alternative_services.set(true);
1047 }
1048
1049 // static
1050 void IOThread::RegisterPrefs(PrefRegistrySimple* registry) {
1051   registry->RegisterStringPref(prefs::kAuthSchemes,
1052                                "basic,digest,ntlm,negotiate");
1053   registry->RegisterBooleanPref(prefs::kDisableAuthNegotiateCnameLookup, false);
1054   registry->RegisterBooleanPref(prefs::kEnableAuthNegotiatePort, false);
1055   registry->RegisterStringPref(prefs::kAuthServerWhitelist, std::string());
1056   registry->RegisterStringPref(prefs::kAuthNegotiateDelegateWhitelist,
1057                                std::string());
1058   registry->RegisterStringPref(prefs::kGSSAPILibraryName, std::string());
1059   registry->RegisterStringPref(prefs::kAuthAndroidNegotiateAccountType,
1060                                std::string());
1061   registry->RegisterStringPref(
1062       data_reduction_proxy::prefs::kDataReductionProxy, std::string());
1063   registry->RegisterBooleanPref(prefs::kEnableReferrers, true);
1064   data_reduction_proxy::RegisterPrefs(registry);
1065   registry->RegisterBooleanPref(prefs::kBuiltInDnsClientEnabled, true);
1066   registry->RegisterBooleanPref(prefs::kQuickCheckEnabled, true);
1067 }
1068
1069 net::HttpAuthHandlerFactory* IOThread::CreateDefaultAuthHandlerFactory(
1070     net::HostResolver* resolver) {
1071   net::HttpAuthFilterWhitelist* auth_filter_default_credentials = NULL;
1072   if (!auth_server_whitelist_.empty()) {
1073     auth_filter_default_credentials =
1074         new net::HttpAuthFilterWhitelist(auth_server_whitelist_);
1075   }
1076   net::HttpAuthFilterWhitelist* auth_filter_delegate = NULL;
1077   if (!auth_delegate_whitelist_.empty()) {
1078     auth_filter_delegate =
1079         new net::HttpAuthFilterWhitelist(auth_delegate_whitelist_);
1080   }
1081   globals_->url_security_manager.reset(
1082       net::URLSecurityManager::Create(auth_filter_default_credentials,
1083                                       auth_filter_delegate));
1084   std::vector<std::string> supported_schemes = base::SplitString(
1085       auth_schemes_, ",", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
1086
1087   scoped_ptr<net::HttpAuthHandlerRegistryFactory> registry_factory(
1088       net::HttpAuthHandlerRegistryFactory::Create(
1089           supported_schemes, globals_->url_security_manager.get(), resolver,
1090           gssapi_library_name_, auth_android_negotiate_account_type_,
1091           negotiate_disable_cname_lookup_, negotiate_enable_port_));
1092   return registry_factory.release();
1093 }
1094
1095 void IOThread::ClearHostCache() {
1096   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
1097
1098   net::HostCache* host_cache = globals_->host_resolver->GetHostCache();
1099   if (host_cache)
1100     host_cache->clear();
1101 }
1102
1103 void IOThread::InitializeNetworkSessionParams(
1104     net::HttpNetworkSession::Params* params) {
1105   InitializeNetworkSessionParamsFromGlobals(*globals_, params);
1106 }
1107
1108 // static
1109 void IOThread::InitializeNetworkSessionParamsFromGlobals(
1110     const IOThread::Globals& globals,
1111     net::HttpNetworkSession::Params* params) {
1112   params->host_resolver = globals.host_resolver.get();
1113   params->cert_verifier = globals.cert_verifier.get();
1114   params->cert_policy_enforcer = globals.cert_policy_enforcer.get();
1115   params->channel_id_service = globals.system_channel_id_service.get();
1116   params->transport_security_state = globals.transport_security_state.get();
1117   params->ssl_config_service = globals.ssl_config_service.get();
1118   params->http_auth_handler_factory = globals.http_auth_handler_factory.get();
1119   params->http_server_properties =
1120       globals.http_server_properties->GetWeakPtr();
1121   params->network_delegate = globals.system_network_delegate.get();
1122   params->host_mapping_rules = globals.host_mapping_rules.get();
1123   params->ignore_certificate_errors = globals.ignore_certificate_errors;
1124   params->testing_fixed_http_port = globals.testing_fixed_http_port;
1125   params->testing_fixed_https_port = globals.testing_fixed_https_port;
1126   globals.enable_tcp_fast_open_for_ssl.CopyToIfSet(
1127       &params->enable_tcp_fast_open_for_ssl);
1128
1129   globals.initial_max_spdy_concurrent_streams.CopyToIfSet(
1130       &params->spdy_initial_max_concurrent_streams);
1131   globals.enable_spdy_compression.CopyToIfSet(
1132       &params->enable_spdy_compression);
1133   globals.enable_spdy_ping_based_connection_checking.CopyToIfSet(
1134       &params->enable_spdy_ping_based_connection_checking);
1135   globals.spdy_default_protocol.CopyToIfSet(
1136       &params->spdy_default_protocol);
1137   params->next_protos = globals.next_protos;
1138   globals.trusted_spdy_proxy.CopyToIfSet(&params->trusted_spdy_proxy);
1139   params->forced_spdy_exclusions = globals.forced_spdy_exclusions;
1140   globals.use_alternative_services.CopyToIfSet(
1141       &params->use_alternative_services);
1142   globals.alternative_service_probability_threshold.CopyToIfSet(
1143       &params->alternative_service_probability_threshold);
1144
1145   globals.enable_quic.CopyToIfSet(&params->enable_quic);
1146   globals.enable_insecure_quic.CopyToIfSet(&params->enable_insecure_quic);
1147   globals.enable_quic_for_proxies.CopyToIfSet(&params->enable_quic_for_proxies);
1148   globals.quic_always_require_handshake_confirmation.CopyToIfSet(
1149       &params->quic_always_require_handshake_confirmation);
1150   globals.quic_disable_connection_pooling.CopyToIfSet(
1151       &params->quic_disable_connection_pooling);
1152   globals.quic_load_server_info_timeout_srtt_multiplier.CopyToIfSet(
1153       &params->quic_load_server_info_timeout_srtt_multiplier);
1154   globals.quic_enable_connection_racing.CopyToIfSet(
1155       &params->quic_enable_connection_racing);
1156   globals.quic_enable_non_blocking_io.CopyToIfSet(
1157       &params->quic_enable_non_blocking_io);
1158   globals.quic_prefer_aes.CopyToIfSet(&params->quic_prefer_aes);
1159   globals.quic_disable_disk_cache.CopyToIfSet(
1160       &params->quic_disable_disk_cache);
1161   globals.quic_max_number_of_lossy_connections.CopyToIfSet(
1162       &params->quic_max_number_of_lossy_connections);
1163   globals.quic_packet_loss_threshold.CopyToIfSet(
1164       &params->quic_packet_loss_threshold);
1165   globals.quic_socket_receive_buffer_size.CopyToIfSet(
1166       &params->quic_socket_receive_buffer_size);
1167   globals.enable_quic_port_selection.CopyToIfSet(
1168       &params->enable_quic_port_selection);
1169   globals.quic_max_packet_length.CopyToIfSet(&params->quic_max_packet_length);
1170   globals.quic_user_agent_id.CopyToIfSet(&params->quic_user_agent_id);
1171   globals.quic_supported_versions.CopyToIfSet(
1172       &params->quic_supported_versions);
1173   params->quic_connection_options = globals.quic_connection_options;
1174
1175   globals.origin_to_force_quic_on.CopyToIfSet(
1176       &params->origin_to_force_quic_on);
1177   params->enable_user_alternate_protocol_ports =
1178       globals.enable_user_alternate_protocol_ports;
1179 }
1180
1181 base::TimeTicks IOThread::creation_time() const {
1182   return creation_time_;
1183 }
1184
1185 net::SSLConfigService* IOThread::GetSSLConfigService() {
1186   return ssl_config_service_manager_->Get();
1187 }
1188
1189 void IOThread::ChangedToOnTheRecordOnIOThread() {
1190   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
1191
1192   // Clear the host cache to avoid showing entries from the OTR session
1193   // in about:net-internals.
1194   ClearHostCache();
1195 }
1196
1197 void IOThread::InitSystemRequestContext() {
1198   if (system_url_request_context_getter_.get())
1199     return;
1200   // If we're in unit_tests, IOThread may not be run.
1201   if (!BrowserThread::IsMessageLoopValid(BrowserThread::IO))
1202     return;
1203   system_proxy_config_service_.reset(
1204       ProxyServiceFactory::CreateProxyConfigService(
1205           pref_proxy_config_tracker_.get()));
1206   system_url_request_context_getter_ =
1207       new SystemURLRequestContextGetter(this);
1208   // Safe to post an unretained this pointer, since IOThread is
1209   // guaranteed to outlive the IO BrowserThread.
1210   BrowserThread::PostTask(
1211       BrowserThread::IO,
1212       FROM_HERE,
1213       base::Bind(&IOThread::InitSystemRequestContextOnIOThread,
1214                  base::Unretained(this)));
1215 }
1216
1217 void IOThread::InitSystemRequestContextOnIOThread() {
1218   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
1219   DCHECK(!globals_->system_proxy_service.get());
1220   DCHECK(system_proxy_config_service_.get());
1221
1222   const base::CommandLine& command_line =
1223       *base::CommandLine::ForCurrentProcess();
1224   globals_->system_proxy_service.reset(
1225       ProxyServiceFactory::CreateProxyService(
1226           net_log_,
1227           globals_->proxy_script_fetcher_context.get(),
1228           globals_->system_network_delegate.get(),
1229           system_proxy_config_service_.release(),
1230           command_line,
1231           quick_check_enabled_.GetValue()));
1232
1233   net::HttpNetworkSession::Params system_params;
1234   InitializeNetworkSessionParams(&system_params);
1235   system_params.net_log = net_log_;
1236   system_params.proxy_service = globals_->system_proxy_service.get();
1237
1238   globals_->system_http_transaction_factory.reset(
1239       new net::HttpNetworkLayer(
1240           new net::HttpNetworkSession(system_params)));
1241   globals_->system_url_request_job_factory.reset(
1242       new net::URLRequestJobFactoryImpl());
1243   globals_->system_request_context.reset(
1244       ConstructSystemRequestContext(globals_, net_log_));
1245   globals_->system_request_context->set_ssl_config_service(
1246       globals_->ssl_config_service.get());
1247   globals_->system_request_context->set_http_server_properties(
1248       globals_->http_server_properties->GetWeakPtr());
1249 }
1250
1251 void IOThread::UpdateDnsClientEnabled() {
1252   globals()->host_resolver->SetDnsClientEnabled(*dns_client_enabled_);
1253 }
1254
1255 void IOThread::ConfigureQuic(const base::CommandLine& command_line) {
1256   // Always fetch the field trial group to ensure it is reported correctly.
1257   // The command line flags will be associated with a group that is reported
1258   // so long as trial is actually queried.
1259   std::string group =
1260       base::FieldTrialList::FindFullName(kQuicFieldTrialName);
1261   VariationParameters params;
1262   if (!variations::GetVariationParams(kQuicFieldTrialName, &params)) {
1263     params.clear();
1264   }
1265
1266   ConfigureQuicGlobals(command_line, group, params, is_quic_allowed_by_policy_,
1267                        globals_);
1268 }
1269
1270 // static
1271 void IOThread::ConfigureQuicGlobals(
1272     const base::CommandLine& command_line,
1273     base::StringPiece quic_trial_group,
1274     const VariationParameters& quic_trial_params,
1275     bool quic_allowed_by_policy,
1276     IOThread::Globals* globals) {
1277   bool enable_quic = ShouldEnableQuic(command_line, quic_trial_group,
1278                                       quic_allowed_by_policy);
1279   globals->enable_quic.set(enable_quic);
1280   bool enable_quic_for_proxies = ShouldEnableQuicForProxies(
1281       command_line, quic_trial_group, quic_allowed_by_policy);
1282   globals->enable_quic_for_proxies.set(enable_quic_for_proxies);
1283   if (enable_quic) {
1284     globals->enable_insecure_quic.set(
1285         ShouldEnableInsecureQuic(command_line, quic_trial_params));
1286     globals->quic_always_require_handshake_confirmation.set(
1287         ShouldQuicAlwaysRequireHandshakeConfirmation(quic_trial_params));
1288     globals->quic_disable_connection_pooling.set(
1289         ShouldQuicDisableConnectionPooling(quic_trial_params));
1290     int receive_buffer_size = GetQuicSocketReceiveBufferSize(quic_trial_params);
1291     if (receive_buffer_size != 0) {
1292       globals->quic_socket_receive_buffer_size.set(receive_buffer_size);
1293     }
1294     float load_server_info_timeout_srtt_multiplier =
1295         GetQuicLoadServerInfoTimeoutSrttMultiplier(quic_trial_params);
1296     if (load_server_info_timeout_srtt_multiplier != 0) {
1297       globals->quic_load_server_info_timeout_srtt_multiplier.set(
1298           load_server_info_timeout_srtt_multiplier);
1299     }
1300     globals->quic_enable_connection_racing.set(
1301         ShouldQuicEnableConnectionRacing(quic_trial_params));
1302     globals->quic_enable_non_blocking_io.set(
1303         ShouldQuicEnableNonBlockingIO(quic_trial_params));
1304     globals->quic_disable_disk_cache.set(
1305         ShouldQuicDisableDiskCache(quic_trial_params));
1306     globals->quic_prefer_aes.set(
1307         ShouldQuicPreferAes(quic_trial_params));
1308     int max_number_of_lossy_connections = GetQuicMaxNumberOfLossyConnections(
1309         quic_trial_params);
1310     if (max_number_of_lossy_connections != 0) {
1311       globals->quic_max_number_of_lossy_connections.set(
1312           max_number_of_lossy_connections);
1313     }
1314     float packet_loss_threshold = GetQuicPacketLossThreshold(quic_trial_params);
1315     if (packet_loss_threshold != 0)
1316       globals->quic_packet_loss_threshold.set(packet_loss_threshold);
1317     globals->enable_quic_port_selection.set(
1318         ShouldEnableQuicPortSelection(command_line));
1319     globals->quic_connection_options =
1320         GetQuicConnectionOptions(command_line, quic_trial_params);
1321   }
1322
1323   size_t max_packet_length = GetQuicMaxPacketLength(command_line,
1324                                                     quic_trial_params);
1325   if (max_packet_length != 0) {
1326     globals->quic_max_packet_length.set(max_packet_length);
1327   }
1328
1329   std::string quic_user_agent_id = chrome::GetChannelString();
1330   if (!quic_user_agent_id.empty())
1331     quic_user_agent_id.push_back(' ');
1332   quic_user_agent_id.append(
1333       version_info::GetProductNameAndVersionForUserAgent());
1334   quic_user_agent_id.push_back(' ');
1335   quic_user_agent_id.append(content::BuildOSCpuInfo());
1336   globals->quic_user_agent_id.set(quic_user_agent_id);
1337
1338   net::QuicVersion version = GetQuicVersion(command_line, quic_trial_params);
1339   if (version != net::QUIC_VERSION_UNSUPPORTED) {
1340     net::QuicVersionVector supported_versions;
1341     supported_versions.push_back(version);
1342     globals->quic_supported_versions.set(supported_versions);
1343   }
1344
1345   double threshold = GetAlternativeProtocolProbabilityThreshold(
1346       command_line, quic_trial_params);
1347   if (threshold >=0 && threshold <= 1) {
1348     globals->alternative_service_probability_threshold.set(threshold);
1349     globals->http_server_properties->SetAlternativeServiceProbabilityThreshold(
1350         threshold);
1351   }
1352
1353   if (command_line.HasSwitch(switches::kOriginToForceQuicOn)) {
1354     net::HostPortPair quic_origin =
1355         net::HostPortPair::FromString(
1356             command_line.GetSwitchValueASCII(switches::kOriginToForceQuicOn));
1357     if (!quic_origin.IsEmpty()) {
1358       globals->origin_to_force_quic_on.set(quic_origin);
1359     }
1360   }
1361 }
1362
1363 bool IOThread::ShouldEnableQuic(const base::CommandLine& command_line,
1364                                 base::StringPiece quic_trial_group,
1365                                 bool quic_allowed_by_policy) {
1366   if (command_line.HasSwitch(switches::kDisableQuic) || !quic_allowed_by_policy)
1367     return false;
1368
1369   if (command_line.HasSwitch(switches::kEnableQuic))
1370     return true;
1371
1372   return quic_trial_group.starts_with(kQuicFieldTrialEnabledGroupName) ||
1373       quic_trial_group.starts_with(kQuicFieldTrialHttpsEnabledGroupName);
1374 }
1375
1376 // static
1377 bool IOThread::ShouldEnableQuicForProxies(const base::CommandLine& command_line,
1378                                           base::StringPiece quic_trial_group,
1379                                           bool quic_allowed_by_policy) {
1380   return ShouldEnableQuic(
1381       command_line, quic_trial_group, quic_allowed_by_policy) ||
1382       ShouldEnableQuicForDataReductionProxy();
1383 }
1384
1385 // static
1386 bool IOThread::ShouldEnableQuicForDataReductionProxy() {
1387   const base::CommandLine& command_line =
1388         *base::CommandLine::ForCurrentProcess();
1389
1390   if (command_line.HasSwitch(switches::kDisableQuic))
1391     return false;
1392
1393   return data_reduction_proxy::params::IsIncludedInQuicFieldTrial();
1394 }
1395
1396 // static
1397 bool IOThread::ShouldEnableInsecureQuic(
1398     const base::CommandLine& command_line,
1399     const VariationParameters& quic_trial_params) {
1400   if (command_line.HasSwitch(switches::kEnableInsecureQuic))
1401     return true;
1402
1403   return base::LowerCaseEqualsASCII(
1404       GetVariationParam(quic_trial_params, "enable_insecure_quic"),
1405       "true");
1406 }
1407
1408 bool IOThread::ShouldEnableQuicPortSelection(
1409     const base::CommandLine& command_line) {
1410   if (command_line.HasSwitch(switches::kDisableQuicPortSelection))
1411     return false;
1412
1413   if (command_line.HasSwitch(switches::kEnableQuicPortSelection))
1414     return true;
1415
1416   return false;  // Default to disabling port selection on all channels.
1417 }
1418
1419 net::QuicTagVector IOThread::GetQuicConnectionOptions(
1420     const base::CommandLine& command_line,
1421     const VariationParameters& quic_trial_params) {
1422   if (command_line.HasSwitch(switches::kQuicConnectionOptions)) {
1423     return net::QuicUtils::ParseQuicConnectionOptions(
1424         command_line.GetSwitchValueASCII(switches::kQuicConnectionOptions));
1425   }
1426
1427   VariationParameters::const_iterator it =
1428       quic_trial_params.find("connection_options");
1429   if (it == quic_trial_params.end()) {
1430     return net::QuicTagVector();
1431   }
1432
1433   return net::QuicUtils::ParseQuicConnectionOptions(it->second);
1434 }
1435
1436 // static
1437 double IOThread::GetAlternativeProtocolProbabilityThreshold(
1438     const base::CommandLine& command_line,
1439     const VariationParameters& quic_trial_params) {
1440   double value;
1441   if (command_line.HasSwitch(
1442           switches::kAlternativeServiceProbabilityThreshold)) {
1443     if (base::StringToDouble(
1444             command_line.GetSwitchValueASCII(
1445                 switches::kAlternativeServiceProbabilityThreshold),
1446             &value)) {
1447       return value;
1448     }
1449   }
1450   if (command_line.HasSwitch(switches::kEnableQuic)) {
1451     return 0;
1452   }
1453   // TODO(bnc): Remove when new parameter name rolls out and server
1454   // configuration is changed.
1455   if (base::StringToDouble(
1456           GetVariationParam(quic_trial_params,
1457                             "alternate_protocol_probability_threshold"),
1458           &value)) {
1459     return value;
1460   }
1461   if (base::StringToDouble(
1462           GetVariationParam(quic_trial_params,
1463                             "alternative_service_probability_threshold"),
1464           &value)) {
1465     return value;
1466   }
1467   return -1;
1468 }
1469
1470 // static
1471 bool IOThread::ShouldQuicAlwaysRequireHandshakeConfirmation(
1472     const VariationParameters& quic_trial_params) {
1473   return base::LowerCaseEqualsASCII(
1474       GetVariationParam(quic_trial_params,
1475                         "always_require_handshake_confirmation"),
1476       "true");
1477 }
1478
1479 // static
1480 bool IOThread::ShouldQuicDisableConnectionPooling(
1481     const VariationParameters& quic_trial_params) {
1482   return base::LowerCaseEqualsASCII(
1483       GetVariationParam(quic_trial_params, "disable_connection_pooling"),
1484       "true");
1485 }
1486
1487 // static
1488 float IOThread::GetQuicLoadServerInfoTimeoutSrttMultiplier(
1489     const VariationParameters& quic_trial_params) {
1490   double value;
1491   if (base::StringToDouble(GetVariationParam(quic_trial_params,
1492                                              "load_server_info_time_to_srtt"),
1493                            &value)) {
1494     return static_cast<float>(value);
1495   }
1496   return 0.0f;
1497 }
1498
1499 // static
1500 bool IOThread::ShouldQuicEnableConnectionRacing(
1501     const VariationParameters& quic_trial_params) {
1502   return base::LowerCaseEqualsASCII(
1503       GetVariationParam(quic_trial_params, "enable_connection_racing"),
1504       "true");
1505 }
1506
1507 // static
1508 bool IOThread::ShouldQuicEnableNonBlockingIO(
1509     const VariationParameters& quic_trial_params) {
1510   return base::LowerCaseEqualsASCII(
1511       GetVariationParam(quic_trial_params, "enable_non_blocking_io"),
1512       "true");
1513 }
1514
1515 // static
1516 bool IOThread::ShouldQuicDisableDiskCache(
1517     const VariationParameters& quic_trial_params) {
1518   return base::LowerCaseEqualsASCII(
1519       GetVariationParam(quic_trial_params, "disable_disk_cache"), "true");
1520 }
1521
1522 // static
1523 bool IOThread::ShouldQuicPreferAes(
1524     const VariationParameters& quic_trial_params) {
1525   return base::LowerCaseEqualsASCII(
1526       GetVariationParam(quic_trial_params, "prefer_aes"), "true");
1527 }
1528
1529 // static
1530 int IOThread::GetQuicMaxNumberOfLossyConnections(
1531     const VariationParameters& quic_trial_params) {
1532   int value;
1533   if (base::StringToInt(GetVariationParam(quic_trial_params,
1534                                           "max_number_of_lossy_connections"),
1535                         &value)) {
1536     return value;
1537   }
1538   return 0;
1539 }
1540
1541 // static
1542 float IOThread::GetQuicPacketLossThreshold(
1543     const VariationParameters& quic_trial_params) {
1544   double value;
1545   if (base::StringToDouble(GetVariationParam(quic_trial_params,
1546                                              "packet_loss_threshold"),
1547                            &value)) {
1548     return static_cast<float>(value);
1549   }
1550   return 0.0f;
1551 }
1552
1553 // static
1554 int IOThread::GetQuicSocketReceiveBufferSize(
1555     const VariationParameters& quic_trial_params) {
1556   int value;
1557   if (base::StringToInt(GetVariationParam(quic_trial_params,
1558                                           "receive_buffer_size"),
1559                         &value)) {
1560     return value;
1561   }
1562   return 0;
1563 }
1564
1565 // static
1566 size_t IOThread::GetQuicMaxPacketLength(
1567     const base::CommandLine& command_line,
1568     const VariationParameters& quic_trial_params) {
1569   if (command_line.HasSwitch(switches::kQuicMaxPacketLength)) {
1570     unsigned value;
1571     if (!base::StringToUint(
1572             command_line.GetSwitchValueASCII(switches::kQuicMaxPacketLength),
1573             &value)) {
1574       return 0;
1575     }
1576     return value;
1577   }
1578
1579   unsigned value;
1580   if (base::StringToUint(GetVariationParam(quic_trial_params,
1581                                            "max_packet_length"),
1582                          &value)) {
1583     return value;
1584   }
1585   return 0;
1586 }
1587
1588 // static
1589 net::QuicVersion IOThread::GetQuicVersion(
1590     const base::CommandLine& command_line,
1591     const VariationParameters& quic_trial_params) {
1592   if (command_line.HasSwitch(switches::kQuicVersion)) {
1593     return ParseQuicVersion(
1594         command_line.GetSwitchValueASCII(switches::kQuicVersion));
1595   }
1596
1597   return ParseQuicVersion(GetVariationParam(quic_trial_params, "quic_version"));
1598 }
1599
1600 // static
1601 net::QuicVersion IOThread::ParseQuicVersion(const std::string& quic_version) {
1602   net::QuicVersionVector supported_versions = net::QuicSupportedVersions();
1603   for (size_t i = 0; i < supported_versions.size(); ++i) {
1604     net::QuicVersion version = supported_versions[i];
1605     if (net::QuicVersionToString(version) == quic_version) {
1606       return version;
1607     }
1608   }
1609
1610   return net::QUIC_VERSION_UNSUPPORTED;
1611 }